Bac. 1, 1902.1 THE TROPICAL AGRICULTURIST. 
418 
in this bcHiitifuI Isle of the sea. I hpve no spe- 
cial rpinai ks to make on cncao crenerally. There 
are younger and nioie up-to-date cacao planters 
DOW in tiie field who would be able to pive you 
more irifoiniation lhan 1 can. After 1896 I li^d 
personally little to do with it. Up to about ihat 
tiaie I got fair yields fioni iny place, and very 
good prices. Then the price went down with a 
run and cacao had to take a back seat. Tea was 
all the go, and chief favourite, and no wonder, 
seeing that it was more easily dealt with in plant- 
ing, preparation, freedom from pests, and as giving 
quicker and better returns. 
I consider this climate rather wet. My cacao 
elevation is frum (say) 1,600 to 2,000 feet above sea 
level. My oldest trees weve planted (with a view 
to extended cnltivationj in November 1873 — seed at 
stake, and they are still to the fore, though I must 
say Helopeltis has made its withering mark on 
some parts. Were I a young man, I should like 
to have another innings at cacao in spite of all the 
ills it is heir to, and tiiey are many ! 
Experience, capital and suitable land there is no 
getting on without, and a lot of attention must, be 
devoted to it. from first to last. Cacao and Para 
Kubber should do well togetlief, I wonder there is 
not more grown in Native gaidens— « la native 
coffee — where there aie hundieds, yea thousands, of 
ideal spots suitable for its growtli. I'he prevalence 
of stealing is a great drawback. A villa^ercannot 
grow vegetables or fruits, etc., but some rascal, 
who toils not, watches his opportunity to rob, and 
the poor cultivator isleffc lamenting. And that is 
the reason a large quantity of unripe fruit; and 
vegetable.? is brought to market, — Yours truly, 
J. D. 
GREEN TEA: A QUERY. 
16th Oct. 
Dear Sib,— It wottlcl be interesting to 
know from manufacturers of Green Tea what 
outturn or percentage from leaf, for say a 
whole season, is generally secured as against 
that made into Black Tea, conditions being 
equal. — Yours truly, 
VERDANT GREEN. 
[The experience of some of the larger Green 
Tea manufacturers in Ceylon is, we believe, 
that they get quite as large a percentage 
of green tea from a given quantity of leaf, 
as they did formerly of black,— Ed, T.A.] 
HtJMlDITY OF THE ATMOSPHERE. 
Katugastota Estate, Oct. 18. 
Dear Pir,— Will you or any of the sub- 
scribers to your paper tell me how to work 
out the humidity of the atmosphere, i.e., 
given the temperatures shown by the dry 
and wet bulb thermometer how can the 
humidity of the atmosphere be deducted. 
HUMIDITY. 
[The following table gives the information your 
correspondent requires ; the saturation point being 
taken 
water 
at 100, the figures give the poro-n';age of 
vapour in the air : — 
Temperature o£ dry bulb thermometer. 
bo 
tn 
o 
i5 
M 
O 
o 
M 
CO 
CO 
Q 
rH 
Difff 
CO 
Diff« 
03 
Q 
o 
I— t 
Diff( 
0 
100 
100 
100 
100 
100 
100 
6 
6 
6 
5 
5 
5 
2 
88 
88 
89 
90 
90 
90 
6 
5 
5 
5 
5 
4 
4 
76 
78 
79 
80 
81 
82 
5 
5 
4 
4 
4 
4 
6 
66 
68 
71 
72 
73 
74 
4 
4 
4 
4 
4 
3 
8 
58 
60 
63 
64 
66 
68 
4 
4 
4 
4 
3 
3 
10 
50 
52 
65 
57 
59 
61 
3 
3 
3 
3 
3 
3 
12 
43 
46 
49 
51 
53 
55 
3 
3 
3 
3 
3 
3 
14 
37 
40 
43 
45 
48 
49 
3 
O 
2 
2 
2 
2 
16 
32 
35 
38 
41 
43 
45 
2 
2 
2 
2 
2 
2 
18 
28 
31 
34 
36 
38 
40 
Example. — What is the humidity when the dry 
bulb thermometer shows 86 and the diffarence between 
the dry and wet bulbs is 9" 1 
For temperature 84" and difference 8° the table 
gives 64 ; the difference for 1° being 4. 
For temperature 84 and difference 9° the per- 
cenfcage ia therefore 64 — 4 = 60. 
Now with diff. 8" and temp. 84" the p'tage is 64 (from 
table.) 
8« „ 92° „ 66 (from 
table.) 
For a diff. in temp, of 8'^ the diff. p'tage is 2 increasing, 
and „ for „ 2° „ „ J „ 
Hence the percentage of humidity at 86° with a 
difference of 9« is 60 + i=60i %. H. O. B.] 
SEED OP "GMELAIA ARBOREA": A 
CHANCE FOR THE MANAGER OP 
ABBOTSFORD AND OTHERS. 
October ^3. 
[To the Editor '■ Tropical AgricuUurisf,"] 
Sib,— With reference to the letter in your 
number of Isfc October, 1902, from '• John 
Fraser," I have the honour to state that 
there is a large amount of Gvielaia Arborea 
in the forests of the North Coimbatore divi- 
sion, and that I could supply him with seed 
at the proper seison (Ma'ch-Jiine). This 
year was a magnificeint seeding year and 
had I only known in time 1 could have 
supplied him with a large amount. Unfor- 
tunately, a heavy seeding year is generally 
followed by one or two bad years and so I 
have doubts about being able to collect 
large quantities for the next year or two. 
I should like to know about what amount 
Mr. Johu Fraser requires.— I have the honor 
to be. Sir, your most obdt. servant, 
A. W. LUSHINGTON, 
District Forest Officer, Coimbatore (North), 
